Rolling bearing unit

Details Rolling bearing unit Rolling bearing unit

2002-07-01

2004-07-13

Hannon, Thomas R. (Department: 3682)

Bearings

Rotary bearing

Antifriction bearing

C384S537000, C360S099080

Reexamination Certificate

active

06761485

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a rolling bearing unit that is desirably used in a location where there is high-speed minute rocking motion, such as for use in the swing arm of a magnetic disk apparatus.
2. Description of the Related Art
In a prior art rolling bearing unit for a swing arm, in the case of 3.5 “HDD” as shown in
FIG. 15
, ball bearings
100
with a grease sealed in them are used under a specified pre-load. An E block
200
is integrally formed with a swing arm or swing arms. As to the E block
200
, mainly used are a pulling type in which a single bolt
400
is screwed into the central portion of the housing
300
for bolt-fastening, and an adhesion type, not shown in the figures, in which the outer-diameter side
301
of the housing
300
is adhesion-fixed to the inner peripheral surface of the E block
200
.
In addition, mainly used in the case of 2.5 “HDD” as shown in
FIG. 16
is an integration type which comprises press-formed flat plates
201
and spacers
500
each provided between a pair of the flat plates
201
, which are fixed to the housing
300
between a flange portion of the housing
300
and a nut
600
.
Recently, there is an increasing demand for higher density magnetic disk devices. In order to accomplish this, the track width on which signals are recorded on the disk have become increasingly more narrow, and there is a demand that the swing arm(s) installed in the head for reproducing the signals be capable of accessing the target track at high-speed and with highly precise positioning. A method of clamping a couple of disks for the pivot is developed in order to satisfy the demand, without using the housing.
Conventionally, as shown in
FIG. 15
, the housing
300
is pulled via the bolt
400
toward the E block
200
side at one location in the center of the outer-diameter side of the housing
300
, so that the E block
200
is clamped through contact between the housing
300
and E block
200
, which needs the member for the housing
300
and expensive.
In the case of the integration type shown in
FIG. 16
where the arm
200
is directly mounted to the housing
300
, flange processing or screw processing is required for the housing
300
, which is expensive.
SUMMARY OF THE INVENTION
Taking the above problems with the prior art into consideration, an object of this invention is to provide a rolling bearing unit that does not use the housing to reduce the number of parts, and in which the are is precisely fixed to the pivot.


REFERENCES:
patent: 4480881 (1984-11-01), Fujimori
patent: 4818907 (1989-04-01), Shirotori
patent: 4882643 (1989-11-01), Shirotori
patent: 4900958 (1990-02-01), Kitahara et al.
patent: 5045738 (1991-09-01), Hishida et al.
patent: 5274288 (1993-12-01), Stefansky
patent: 5381066 (1995-01-01), Miyaji et al.
patent: 5606475 (1997-02-01), Ishizuka
patent: 5687016 (1997-11-01), Seto
patent: 5945751 (1999-08-01), Hans et al.
patent: 401164815 (1989-06-01), None

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